SAT question a9647302 (Distributions, Center & Spread)

Question

For quality control, a company that manufactures lightbulbs conducted five different trials. In each trial, $500$ different lightbulbs were tested. The bar graph above shows the number of defective lightbulbs found in each trial. What is the mean number of defective lightbulbs for the five trials?

57

Difficulty:Easy

A

$4.0$

B

$4.2$

C

$4.6$

D

$5.0$

College Board · Accepted Answer

The correct answer is B. Choice B is correct. The numbers of defective lightbulbs found for the five trials are 4 , 7 , 1 , 3 , and 6 , respectively. The mean is therefore (4 + 7 + 1 + 3 + 6)/5 = 4.2 .

CookSAT · Answer

Note: The mean function directly computes the average of the five defective counts from the bar graph.

Explanation

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Why the other choices are wrong

SAT Question a9647302: Distributions, Center & Spread answer and explanation with Desmos solution

Explanation

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Why the other choices are wrong